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Article: Petrology and P-T path of the Fuping mafic granulites: Implications for tectonic evolution of the central zone of the North China craton

TitlePetrology and P-T path of the Fuping mafic granulites: Implications for tectonic evolution of the central zone of the North China craton
Authors
KeywordsContinental Collision
Mafic Granulites
Metamorphism
North China Craton
Tectonic Evolution
Issue Date2000
PublisherWiley-Blackwell Publishing Ltd. The Journal's web site is located at http://www.wiley.com/bw/journal.asp?ref=0263-4929
Citation
Journal Of Metamorphic Geology, 2000, v. 18 n. 4, p. 375-391 How to Cite?
AbstractThe Fuping Complex and the adjoining Wutai and Hengshan Complexes are located in the central zone of the North China craton. The dominant rock types in the Fuping Complex are high-grade tonalitic-trondhjemitic-granodioritic (TTG) gneisses, with minor amounts of mafic granulites, syntectonic granitic rocks and supracrustal rocks. The petrological evidence from the mafic granulites indicates three stages of metamorphic evolution. The M1 stage is represented by garnet porphyroblasts and matrix plagioclase, quartz, orthopyroxene, clinopyroxene and hornblende. Orthopyroxene+plagioclase symplectites and clinopyroxene+plagioclase±orthopyroxene coronas formed in response to decompression during M2 following the peak metamorphism at M1. Hornblende+plagioclase symplectites formed as a result of further isobaric cooling and retrograde metamorphism during M3. The P-T estimates using TWQ thermobarometry are: 900-950°C and 8.0-8.5 kbar for the peak assemblage (M1), based on the core compositions of garnet, matrix pyroxene and plagioclase; 700-800°C and 6.0-7.0 kbar for the pyroxene+plagioclase symplectites or coronas (M2); and 550-650°C and 5.3-6.3 kbar for the hornblende+plagioclase symplectites (M3), based on garnet rim and corresponding symplectic mineral compositions. These P-T estimates define a clockwise P-T path involving near-isothermal decompression for the Fuping Complex, similar to the P-T path estimated for the metapelitic gneisses. The inferred P-T path suggests that the Fuping Complex underwent initial crustal thickening, subsequent exhumation, and finally cooling and retrogression. This tectonothermal path is similar to P-T paths inferred for the Wutai and Hengshan Complexes and other tectonic units in the central zone of the North China craton, but different from anti-clockwise P-T paths estimated for the basement rocks in the eastern and western zones of the craton. Based on lithological, structural, metamorphic and geochronological data, the eastern and western zones of the craton are considered to represent two different Archean to Paleoproterozoic continental blocks that amalgamated along the central zone at the end of Paleoproterozoic. The P-T paths of the Fuping Complex and other tectonic units in the central zone record the collision between the eastern and western zones that led to the final assembly of the North China craton at c. 1800 Ma.
Persistent Identifierhttp://hdl.handle.net/10722/151040
ISSN
2015 Impact Factor: 3.673
2015 SCImago Journal Rankings: 3.397
References

 

DC FieldValueLanguage
dc.contributor.authorZhao, GCen_US
dc.contributor.authorWilde, SAen_US
dc.contributor.authorCawood, PAen_US
dc.contributor.authorLu, LZen_US
dc.date.accessioned2012-06-26T06:16:25Z-
dc.date.available2012-06-26T06:16:25Z-
dc.date.issued2000en_US
dc.identifier.citationJournal Of Metamorphic Geology, 2000, v. 18 n. 4, p. 375-391en_US
dc.identifier.issn0263-4929en_US
dc.identifier.urihttp://hdl.handle.net/10722/151040-
dc.description.abstractThe Fuping Complex and the adjoining Wutai and Hengshan Complexes are located in the central zone of the North China craton. The dominant rock types in the Fuping Complex are high-grade tonalitic-trondhjemitic-granodioritic (TTG) gneisses, with minor amounts of mafic granulites, syntectonic granitic rocks and supracrustal rocks. The petrological evidence from the mafic granulites indicates three stages of metamorphic evolution. The M1 stage is represented by garnet porphyroblasts and matrix plagioclase, quartz, orthopyroxene, clinopyroxene and hornblende. Orthopyroxene+plagioclase symplectites and clinopyroxene+plagioclase±orthopyroxene coronas formed in response to decompression during M2 following the peak metamorphism at M1. Hornblende+plagioclase symplectites formed as a result of further isobaric cooling and retrograde metamorphism during M3. The P-T estimates using TWQ thermobarometry are: 900-950°C and 8.0-8.5 kbar for the peak assemblage (M1), based on the core compositions of garnet, matrix pyroxene and plagioclase; 700-800°C and 6.0-7.0 kbar for the pyroxene+plagioclase symplectites or coronas (M2); and 550-650°C and 5.3-6.3 kbar for the hornblende+plagioclase symplectites (M3), based on garnet rim and corresponding symplectic mineral compositions. These P-T estimates define a clockwise P-T path involving near-isothermal decompression for the Fuping Complex, similar to the P-T path estimated for the metapelitic gneisses. The inferred P-T path suggests that the Fuping Complex underwent initial crustal thickening, subsequent exhumation, and finally cooling and retrogression. This tectonothermal path is similar to P-T paths inferred for the Wutai and Hengshan Complexes and other tectonic units in the central zone of the North China craton, but different from anti-clockwise P-T paths estimated for the basement rocks in the eastern and western zones of the craton. Based on lithological, structural, metamorphic and geochronological data, the eastern and western zones of the craton are considered to represent two different Archean to Paleoproterozoic continental blocks that amalgamated along the central zone at the end of Paleoproterozoic. The P-T paths of the Fuping Complex and other tectonic units in the central zone record the collision between the eastern and western zones that led to the final assembly of the North China craton at c. 1800 Ma.en_US
dc.languageengen_US
dc.publisherWiley-Blackwell Publishing Ltd. The Journal's web site is located at http://www.wiley.com/bw/journal.asp?ref=0263-4929en_US
dc.relation.ispartofJournal of Metamorphic Geologyen_US
dc.rightsJournal of Metamorphic Geology. Copyright © Blackwell Publishing Ltd.-
dc.subjectContinental Collisionen_US
dc.subjectMafic Granulitesen_US
dc.subjectMetamorphismen_US
dc.subjectNorth China Cratonen_US
dc.subjectTectonic Evolutionen_US
dc.titlePetrology and P-T path of the Fuping mafic granulites: Implications for tectonic evolution of the central zone of the North China cratonen_US
dc.typeArticleen_US
dc.identifier.emailZhao, GC:gzhao@hkucc.hku.hken_US
dc.identifier.authorityZhao, GC=rp00842en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1046/j.1525-1314.2000.00264.xen_US
dc.identifier.scopuseid_2-s2.0-0034234336en_US
dc.identifier.hkuros57279-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0034234336&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume18en_US
dc.identifier.issue4en_US
dc.identifier.spage375en_US
dc.identifier.epage391en_US
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridZhao, GC=7403296321en_US
dc.identifier.scopusauthoridWilde, SA=35254758600en_US
dc.identifier.scopusauthoridCawood, PA=7004146041en_US
dc.identifier.scopusauthoridLu, LZ=37042358100en_US

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